C#

private static readonly double[] PayRate =
    new double[4] {
        3.00,
        4.15,
        6.42,
        7.95 };

static void Main()
{
    Console.WriteLine("Enter your forename:");
    string forename = Console.ReadLine();
    Console.WriteLine("Enter your surname:");
    string surname = Console.ReadLine();
    Checkout();
    Console.ReadKey();
}

private static void Checkout()
{
    Console.WriteLine("You are ready to check out.");
    for (int i = 0; i < PayRate.Length; i++)
        Console.WriteLine("Pay rate {0} is {1:C}", i, PayRate[i]);
}

const int MAX_BOOK = 5;
public static void personalDetails()
{
    string[,] books = {
        { "The Time Machine, Science Fiction, By H.G.Wells", "3" },
        { "Ender's Game, Science Fiction, By Orson Scott Card", "1" } };

    int book = 0;
    if (book >= MAX_BOOK)
        Console.WriteLine("You are at your limit!");
}

string [,] books = {

{"The Time Machine, Science Fiction, By H.G.Wells","3"}, // Note the comman, and not a semi-colon

{"The Da Vinci Code, Mystery, By Dan Brown","2"}};

int book;

const int MAX_BOOK = 5;

Console.WriteLine("You are at your limit!");

Pete O'Hanlon wrote:

you declare book but you don't set it to a value so it will never trigger the WriteLine condition because an int defaults to 0.

XmlDocument configDoc = new XmlDocument();
             XmlNode parentNode = null;
             configDoc.Load(tConfigfilePath);
             if (null != configDoc)
             {
                   XmlNode  Id = configDoc.SelectSingleNode("/CCC/AAA");
                   // Here the value set to object. which is datamember class.
                   Id.SetValue("ZZZ", detectOid.InnerText);

             }

private void XMlreaderProcess()
     {
        long delayTimeSpanTicks = 0;
 
         try
         {
             while (Active)
             {
                 try
                 {
                     triggerCtrl.Reset();                     
 
                     if (delayTimeSpanTicks == 0)
                     {
                          triggerCtrl.WaitOne();
                     }
                     else
                     {
                          triggerCtrl.WaitOne(new TimeSpan(delayTimeSpanTicks));
                     }
                     
                            StartProcess();
                 }
                 catch(Exception ex)
                 {
                     delayTimeSpanTicks = 0;
                     
                 }
                 finally
                 {
                     
                 }
             }
         }
         catch(Exception ex)
         {
             
         }
         finally
         {
             Active= false;
        }

// assume this Click EventHandler is used by several buttons. I also assume you are going to want to execute different code for each different Button's Click Event.

private void ButtonsForWhatEver_Click(object sender, EventArgs e)
{
    switch((sender as Button).Name)
    {
        case "btn_whatEver1":
            // call a method with code common to all Buttons here
            // call code for this specific Button here
            break;
        case "btn_whatEver2":
            // call a method with code common to all Buttons here
            // call code for this specific Button here
            break;
        case "btn_whatEver4":
            // call a method with code common to all Buttons here
            // call code for this specific Button here
            break;
        default:
            // you reach here if you have not
            // had a match on a Button's name
            // ignore ? throw an error ? put up a Dialogue ?
            //
            // my choice would be to throw an error during development:
            // force yourself to correct a mis-call sooner rather than later
            break;
    }
}